[openstreetmap/openstreetmap-website] Forbid anonymous comments for notes (#1543)

[Philippe Verdy]

classic bahesian spam detection can help: if the bahesian score is too low, discard it directly from anonymous users. If it's in a middle range (possibly frequent, but also in comments sent by logged in users), consider using a captcha to confirm it (and inform the user that he could avoid the captcha by creating an account and logging in).
If the comment is long enough (giving details, or a non intrusive link e.g. to a photo site where users must be logged in, or to wellknown peer-reviewed data sources, consider adding it reasonnably so that these details can be reevaluated, or explaining a situation like local changes not currently visible in the aerial, or recent works/damages, or a press article) it can be kept (as long as the link itself is not in a banned spamming domain)
Bahesian score filters work quite well for emails, why couldn't they be used for comments ? There are already good datasources for evaluating mail contents if we don't want to host out own local database for Bahesian evaluation (e.g. Wikimedia uses several parsers to autodetect and evaluate edits in articles, plus some whitelists and blacklists, and other sources like DNSBL providers)

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